Tap-changing interlock



June 17,1930. I L,H,HH LErAL "1,764,405

TAP CHANGING INTERLOGK Filed May 27 1926.

WITNESSES: INVENTORS' Wa/fer M. Damn &

w m x v V ATTORNEYv nwai filed I May "27,

' lock ng dev ce between a iictqi -pperatlng 'chanis ni and; ainanually operating mech- V Lfgtii interlocking device 1 between-the m nual and the mbtor Operating mechanisms for a Y; "10 cpeiteticnfof t hemofqo r g' driving mechanism 7 1 While them'anual operating mechanism is J-- 1 on ec d;-

object of ourinvention is to pronA h rvylid e anintei lock between .themotpr dr ving 1 mech'gu is m and the manual operating mecha- :nism of a tap ch an ging device such t hat' the i cngagement of phe'manugl operating,mecha-,

' j'nisfn iththe main sh aftf shall automafcicglly 1 Q ithe objechqf our invent on 1s t0 'plfbizide indicating and ws tpp device; fona I T iel thel n d vi that; sh l: be hmfi me w-rat wh n t emwu o t g mwhanism b icl ht o e ag m n it he" H i ldI UQ h f -1 v .i Y.

, for selectlve'motqr orman al drives;- iWhen fl 'u pwh n ze'vicem or; i en,

tem 0f. pilot switches ccntrolsi the ppera';

- Q fli film 1 01 1 9 that h t p-c apging mechanism 1 movesv but it single step. 111 re.-

' in r o kf l' s: e einaf f ciiib 1'1 apparatus-em devices and pai ti'cul arly "tol an f inter cbj'fect 101i1 isv to provide rchgingi'rig Qevices aie r v e, e. Vrelative fco,theindex; lse i ea h. 1 3 T Za flQ poi he; m or. 39 'wevr whensuch dexqces a e manually eh -flm eve 9 Q moving the shaft 16 111,

ELAN HQHILL' AND WAL R M; DA-NVNQOFZ SHARQNQBENNSYLVAiTIA ASSIG;1\TQ3SET [WESTINGHOUSE ELECTRIC ANDMANUFAGTURING MP N CORIQIQATIQN'OF :1 y 1 e, v conn ctedJbyi sh w e wqrm wheelfi thafliihvturn;drives ii'g-iciilllc; L c r 7 ,ing gear7, 1i1ou itedonfphe shafi 1.Abrake band Sis.supported betwee pgf uppbrt ;9.a1i 'd a, resilient mounting lO fciflengagement with i a hu'blQ mqunt ed Qn'the'shaft 5. Anflel etr'omagnetll-is providedifor relca sin githejbrake 7 bandSWhnthe,motOrQ;isenfgizedjf f IQ if .A fitting 13Iis incu itedfatl'onefclid{dike-65,1 1 i; shaft 5Jzmd is-prqvided wijzh gigquarceafi lc. for the reception of 2i key 115, mountedjat one endof ashaif ti 16. A h zi-i d Wheel l Zfis mquiit; ed at the ether cndfbithegshafti161.?E gagimientlbetween the keyjl5fagn clfth 14 is madeloy turning Shaft vl6"a1 b11ta I o jh h th lshait 5 driven the motel 2 29, a second bracket 42 is loosely mounted on the shaft 29 outside of the bracket 41. and terminates in an arm 43 that is adapted to fit into the notches 37 of' the. wheel 36. Springs i t constitute a resilient connection between the bracketsflland 42vwhereby the latter is biased into a downward positionto either engage the brackettl or the wheel 3.6,

ina manner hereinafterdescribed.

- In practicepa plurality of, pilot switches associated with the cams 38. and circuitinterrupter 39 also control the motor 2, but as such pilot switches constitute no part of the presentinvention, and forthe sake of simgplifying the showing of the present invention they havebeen omitted.

For the motor operation of theshaft 1,

the manual operating mechanism 3 is disconnected from the shaft 5 and the interlock 4 is. in the relative position shown in the drawing. Under such conditions, the motor 2 rotates thereby causing'the cams 38'to alternately open and close the circuit interrupters 39 thereby to control the tap connections of a transformer, not shown.

For the manual operation of the tap -.changing device, the shaft 16 is forced inwardly to cause. engagement of the key 111 theseat 14 at the same time to impart a counterclock movement to the shaft 27 which movement is transmitted. through the gear 28. to

I the shaft 29. The shaft '29 isgiven a turn-:

'ing l Qvement that'lowers the bracket 41, the arm 30 and the. link 31 with the result that the 413 is brought to bear on the face of the wheel 36,the switch 32 is opened and the brake band 8 is loosened'on the hub12. As previously explained, the opening of switch 32 preventslthe operation of the motor 2, and the loosening of the brake band 8 permits the shaft 5 and the; attached motor 2 i -to be turned"without prohibitive exertion on the part of thegoperatorh With the. parts thus connected, the hand wheel 17 is turned'in either direction to cause the desired sequence of operation of the cams 3.8 The notches "37" are spaced about the r periphery of the wheel 36in such manner w thatthey correspond to the variouspositions f th a s 38.] Accordingly, when the shaft 1- i t d far enough to cause the cams 38 to operate .the desired circuit interrupter 3 the arm will drop into one end 1 of the .n'otches 37- andpreventfurther movement of the shaft 1. The co-operation of the arm 43 and the notches 37 serves to give an indication of the position of the shaft 1 and also to act as a stop for movement of that shaft.-

In order to move the tap changer another stage, it is necessary for the operator to lift the, handle 43 out of a notch 37', after which it'will pass along the face of the wheel 36 until the next notch 37 is engaged thereby indicating the. completion? of another tap chang t hen the manual operating mechanism 3 removed from engagement with the shaft 5, the shaft 29 is moved to raise the bracket 41 far enough to permit the arm43 to clear the periphery of the wheel 36 at the same switch controlling the supply'circui't to the motor, releases the motor brake and brings into operation an indicating and stop mechanism for the shaft.

It is to be understood that. such changes maybe made in the size, disposition and connect ons of the component "parts of our inventlon, as shall fall within the scope of the appended claims. We claim as our invention: ;1.; The*combination with a shaft, a drivmg motor therefor and a brake for the motor, ofmanual means for operating't-he shaft comprisingimeans for releasing the brake. 2. The combinationwith a shaft,a driving motor therefor, a supply circuit and a brake for the motor, of manual means for operatng the shaft comprising means for releasing from its supply circuiti" 3. The combination with a shaft and a dr vlng motor therefor, of manual means the brake and for disconnecting the motor for operating the shaft and a positioning device for the shaft rendered operative bythe manipulation of the'manu'al operating means.

. 4. The combination with a shaft and a drivlng motor therefor, of manual means for forthe shaft rendered operative upon. the engagement of the shaft by the manual oper- I ment of the-shaftwith the" manual operating means "for controlling the switch and brake.

6. The combination with a shaft, a driv .in-g-fmotor, a,brake,1a switcli 'for the motor and a detachable.mianual ooperating' means forthe s liaft,'of an armactuaad by the engagementof the shaft the manual ,op-.

g I operating the shaft,'and a positioning device motor, a brake-,;asw1tchfor theimotorjand'a detachable manual operating means for the shaft,jof an arm" actuated uponthe [engagecrating means, for controlling the switch, the t brake; and a position indicating and stop 5 vmeansassociated with theshaft. 1 5' 7. The combination with a shaft, a notche *5 wheelcarried thereby and a detachable opflerating mechanism; of a stop mechanism p fbronght into engagement with the notched wheel'during. the connection of the'detach- I '-able operating mechanism to'theshaft'. 8.1jThe combination with ashaft and a l notched wheel carried thereby, of an indicat ing and stop mechanism comprising a sec- 0nd shaft'and an arm yieldingly supported said second shaft to be turned into engagement with said notched wheel. c v

9, The combination with a shaft and a1 fnotched wheelfcarried,ethereby', of an indi-:-

I eating and stop mechanismcomprising a- I f' second shaft, a bracket fixedly attached" to 6 the second'shaft,p a second. bracket loosely gmonnted; thereon, avresil'ient connection be- 7 tween the brackets andan arm monnted on one ofthe brackets whereby upon the turning fof'the second shaft the arm is brought into v, l 5 5 yielding engagement with the notched wheeLx I ".Q'Inj testimony or whereof, we have'her'eunto c subscribd our names thislth day of April,

1926' LELAnD H. HILL. 1

WA T 

